CN103199503B - Protective circuit of vehicle-mounted charger - Google Patents
Protective circuit of vehicle-mounted charger Download PDFInfo
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- CN103199503B CN103199503B CN201310107211.0A CN201310107211A CN103199503B CN 103199503 B CN103199503 B CN 103199503B CN 201310107211 A CN201310107211 A CN 201310107211A CN 103199503 B CN103199503 B CN 103199503B
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- amplifier chip
- relay
- protective circuit
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- 230000001681 protective effect Effects 0.000 title claims abstract description 40
- 239000004065 semiconductor Substances 0.000 claims abstract description 21
- 238000012360 testing method Methods 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract description 4
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000009993 protective function Effects 0.000 abstract 1
- 238000005070 sampling Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910001006 Constantan Inorganic materials 0.000 description 2
- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The invention provides a protective circuit of a vehicle-mounted charger. The protective circuit of the vehicle-mounted charger comprises an operational amplifier chip U1, a diode D1, a diode D2, a metal oxide semiconductor (MOS) pipe Q1, a capacitor C1, a capacitor C2, a relay RL1 and a plurality of resistors. According to the protective circuit of the vehicle-mounted charger, a hysteresis comparator is composed of the operational amplifier chip U1 and the resistors, anti-back-charging protection and short-circuit protection are achieved through the hysteresis comparator and the relay, a battery-polarity-reverse protective function is achieved through the resistors and the diodes, therefore short-circuit protection, reverse-polarity protection, battery-back-charging prevention on the vehicle-mounted charger are simultaneously achieved, the system performance of the vehicle-mounted charger is greatly improved, and the service life of the vehicle-mounted charger is greatly prolonged.
Description
Technical field
The present invention relates to circuit protection field, relate to a kind of protective circuit of onboard charger more specifically.
Background technology
Electric automobile vehicle-mounted power battery charger used is the another emerging research field of Switching Power Supply, the voltage of general vehicle mounted dynamic battery is at more than 200V, more than 300V is reached after being full of, if when charger and battery are connected in this case, battery can to the capacitor charging in charger, produce the electric current of tens A peace even up to a hundred instantaneously, easily damage electric capacity and sampling resistor, therefore this big current counter is filled the destruction of existing onboard charger huge.In addition for vehicle-mounted power battery charger, if when the output of charger is short-circuited, be equivalent to the capacitance short-circuit of charger, also can produce big current instantaneously, same this big current also can damage electric capacity in charger and sampling resistor.Damage if in addition battery and charger reversal connection also can be produced devices such as the electric capacity of charger, diodes.Therefore short-circuit protection, reverse connecting protection, preventing battery, counter to fill protection be the factor must considered in the R & D design of vehicle-mounted power battery charger, be also to improve the technical problem that vehicle-mounted power battery charger application prospect must solve.For avoiding the destruction of big current in charger in prior art; the technology of the sampling resistor sampling of existence paster; but the big current of moment can not be born because its power is less; when solving immediate current often and a diode; but general more than the 0.2V of two pole conduction voltage drops; do not have the effect of protection sampling resistor preferably, and the function of short-circuit protection cannot be realized.Not yet exist in prior art and short-circuit protection, reverse connecting protection are realized to onboard charger simultaneously and prevents the anti-technology of filling protection three zones of battery.
Summary of the invention
The above-mentioned prior art situation of the present invention; a kind of protective circuit for onboard charger is proposed; this protective circuit can realize short-circuit protection, reverse connecting protection in onboard charger simultaneously, prevent that battery is counter fills protection three zones, drastically increases systematic function and the useful life of onboard charger.
The technical scheme that the present invention solves the problems of the technologies described above is as follows:
A kind of protective circuit of onboard charger, comprise amplifier chip U1, diode D1, diode D2, metal-oxide-semiconductor Q1, electric capacity C1 ~ C2, relay R L1 and some resistance, described electric capacity C2 is connected in parallel on power output end OUT1+ and OUT1-of onboard charger, described amplifier chip U1 includes 8 pins, described relay R L1 comprises 4 pins, wherein pin 3 and pin 4 are controlled normally opened contact, the pin 8 of described amplifier chip U1 is connected with voltage source V CC, pin 4 is connected with power output end OUT1-, pin 3 is connected with resistance R6, resistance R6 is connected with voltage source V CC, pin 2 is connected with pin 1, pin 1 is connected with pin 6 by resistance R8, pin 6 is connected with pin 7 by resistance R7, one termination pins 5 of described electric capacity C1, another termination power output end OUT1-, pin 5 connecting resistance R4 and resistance R5, another termination power output end OUT1-of resistance R5, the other end of resistance R4 is connected with power output end OUT1+, the cathode of diode D1 is connected with power output end OUT1+, sun level is connected with resistance R1, the other end of resistance R1 is connected with the charging output OUT2+ of protective circuit, the pin 3 of relay R L1 meets power output end OUT1+, the pin 4 of relay R L1 is connected with charging output OUT2+, the pin 1 of relay meets voltage source V CC, diode D2 is parallel to pin 1 and the pin 2 of relay R L1, the negative electrode of diode D2 connects the pin 1 of relay, the pin 2 of relay is connected with the drain electrode of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor Q1 is connected with power output end OUT1-, the grid of metal-oxide-semiconductor Q1 is connected with the pin 7 of amplifier chip U1, power output end OUT1-is connected with charging output OUT2-by resistance R2.
Further according to protective circuit of the present invention, wherein said amplifier chip U1 adopts the amplifier with built-in a reference source.
Further according to protective circuit of the present invention, the amplifier chip of wherein said amplifier chip U1 to be model be NCS1002-D.
Further according to protective circuit of the present invention; two transport and placing devices are integrated with in wherein said NCS1002-D amplifier chip; described pin 1 and pin 7 are respectively as the output of two transport and placing devices; described pin 4 is connected to the end in the same way of the first transport and placing device after voltage stabilizing didoe with pin 3; described pin 2 is connected to the backward end of the first transport and placing device; described pin 5 is connected to the end in the same way of the second transport and placing device; described pin 6 is connected to the backward end of the second transport and placing device, and described pin 8 provides voltage source for whole amplifier chip.
Further according to protective circuit of the present invention, wherein draw the test side of relay operating state at pin 2 end of described relay.
Further according to protective circuit of the present invention; wherein between described resistance R4 and R5, draw VOL_DET test side; described VOL_DET test side is connected to single-chip microcomputer; described single-chip microcomputer judges when the output voltage of VOL_DET test side is lower than certain value; turn off power stage, realize double protection functions.
Further according to protective circuit of the present invention, wherein said each resistance adopts constantan or copper-manganese resistance.
Further according to protective circuit of the present invention, the power output end OUT1-ground connection of wherein said onboard charger.
Further according to protective circuit of the present invention, wherein said resistance R4 is made up of the resistance that two are connected mutually.
At least following technique effect can be reached by protective circuit of the present invention:
1, on onboard charger, achieve short-circuit protection, reverse connecting protection simultaneously, prevent that battery is counter fills three kinds of defencive functions, drastically increase onboard charger serviceability and life-span;
2, described protective circuit structure simply, easily realizes, cost is low, applied widely, replicability is strong.
Accompanying drawing explanation
Accompanying drawing 1 is the circuit structure schematic diagram of onboard charger protective circuit of the present invention;
Accompanying drawing 2 is the circuit theory diagrams of amplifier chip in onboard charger protective circuit of the present invention.
Embodiment
Be described in detail technical scheme of the present invention below in conjunction with accompanying drawing, to make, those skilled in the art are clearer understands the present invention, but does not therefore limit the scope of the invention.
Protective circuit structure of the present invention as shown in Figure 1; wherein OUT1+ and OUT1-is the power output end of onboard charger; OUT2+ and OUT2-is the final output charged arrange protective circuit of the present invention on onboard charger after, namely connects the power voltage terminal of battery pack.Concrete protective circuit of the present invention comprises power supply, amplifier chip U1, diode D1, diode D2, resistance R1 ~ R8, metal-oxide-semiconductor Q1, electric capacity C1, C2 and relay R L1.Described amplifier chip U1 is provided with pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7, pin 8, U1-A in Fig. 1, U1-B, U1-C expands each pin distribution of amplifier chip, accompanying drawing 2 specifically illustrates the internal circuit schematic diagram of amplifier chip, amplifier chip U1 in the present invention preferably adopts the amplifier chip of model NCS1002-D, its concrete structure as shown in Figure 2, wherein be integrated with two transport and placing devices, pin 1 and pin 7 are respectively as amplifier 1 and 2 output, grounding pin 4 is connected to the end in the same way of amplifier 1 after voltage stabilizing didoe with pin 3, pin 2 is connected to the backward end of amplifier 1, pin 5 is connected to the end in the same way of amplifier 2, pin 6 is connected to the backward end of amplifier 2, pin 8 provides voltage source for whole amplifier chip.
The concrete annexation of protective circuit of the present invention is: electric capacity C2 is connected in parallel on power output end OUT1+ and OUT1-of onboard charger, the pin 8 of described amplifier chip U1 is connected with voltage source V CC, pin 4 is connected with OUT1-, pin 3 is connected with resistance R6, resistance R6 is connected with voltage source V CC, pin 2 is connected with pin 1, and pin 1 is connected with pin 6 by resistance R8, and pin 6 is connected with pin 7 by resistance R7, one termination pins 5 of electric capacity C1, another termination OUT1-, the other end of another termination OUT1-of pin 5 connecting resistance R4 and resistance R5, resistance R5, resistance R4 is connected with resistance R3 (R3 and R4 can merge into a resistance), and the resistance R3 other end is connected with OUT1+, the cathode of diode D1 is connected with OUT1+, sun level is connected with resistance R1, the other end and the protective circuit of the resistance R1 output OUT2+ that charges is connected, 3 pin of relay R L1 meet OUT1+, 4 pin of relay R L1 are connected with OUT2+, 1 pin of relay meets VCC, diode D2 is parallel to pin 1 and the pin 2 of relay R L1, the negative electrode of diode D2 connects relay pin 1, the pin 2 of relay is connected with the drain electrode of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor is connected with OUT1-, the grid of metal-oxide-semiconductor Q1 is connected with the pin 7 of amplifier chip U1, OUT1-is connected by resistance R2 and OUT2-.Preferred described power output end OUT1-ground connection.
Described voltage source V CC is that amplifier chip U1 and relay coil are powered; OUT1+ and OUT1-is the power output end of onboard charger; OUT2+ and OUT2-is the final output of the charger that protective circuit of the present invention is housed, and pin 3 and the pin 4 of relay are normally opened contact.Preferably; RLY is drawn for detecting the work of relay at pin 2 end of described relay; VOL_DET end is drawn between resistance R4 and R5; the output of VOL_DET is sent to peripheral hardware single-chip microcomputer; described single-chip microcomputer judges when the output voltage detected by VOL_DET is lower than certain value; turn off power stage, play double protection functions.Each resistance preferably adopts constantan or copper-manganese sampling resistor.Amplifier preferably adopts the amplifier with built-in a reference source.
Protective circuit of the present invention realizes short-circuit protection, reverse connecting protection, prevents the anti-specific works principle of filling of battery as follows:
Prevent that battery is counter to be filled: when OUT2+ and OUT2-accesses battery pack, pin 3 and the pin 4 of relay disconnect, and not by electric current, electric current is that electric capacity C2 charge by resistance R1 and diode D1, the voltage rising at electric capacity C2 two ends, the pin 3 of amplifier chip U1 receives power supply VCC by resistance R6, the voltage as 2.5V is produced at pin 3, follower effect is played after pin 1 is connected with pin 2, amplifier pin 1 produces the 2.5V having stronger driving force, the pin 5 of amplifier, 6, 7 and resistance R7, resistance R8 realizes the effect of hysteresis comparator, when the voltage of electric capacity C2 is less, through resistance R2, resistance R3, the dividing potential drop of resistance R4 is also lower, the voltage of pin 5 is lower than the voltage of pin 6, the output voltage of pin 7 is low level, now the gate-source voltage of metal-oxide-semiconductor Q1 is low level, metal-oxide-semiconductor Q1 turns off, the pin 3 of relay and pin 4 keep turning off, battery can not charge with the electric capacity C2 that gives of very large electric current, when C2 voltage rise to a certain extent, the voltage of the pin 5 of amplifier is higher than the level of pin 6, hysteresis comparator overturns, the pin 7 of amplifier exports high level, the gate-source voltage of metal-oxide-semiconductor Q1 is high level, and metal-oxide-semiconductor is opened, the pin 3 of relay R L1 and pin 4 conducting, charger is connected with battery and realizes loss-free Energy Transfer, thus effectively achieves cell anti-reverse and rush function.
Reverse connecting protection: if battery reversal connection, namely OUT2-connects the positive pole of battery, and OUT2+ connects the negative pole of battery; the pin 3 of relay R L1 and pin 4 are for often to open, and diode D1 oppositely ends, and can not form path; electrochemical capacitor in circuit is played a protective role, realizes " reverse connecting protection ".
Short-circuit protection: when charger normally works, the voltage of electric capacity C2 is higher, the voltage of the pin 5 of amplifier is higher than the voltage of pin 6, the pin 7 of amplifier exports high level, the gate-source voltage of metal-oxide-semiconductor Q1 is high level, metal-oxide-semiconductor conducting, current from power source VCC, the pin 1 of relay and pin 2, metal-oxide-semiconductor Q1 forms loop, the pin 3 of relay and pin 4 are closed, when there is short circuit in output (between OUT2-and OUT2+), the voltage of electric capacity C2 sharply declines, the voltage drop of VOL_DET, the voltage drop of the pin 5 of amplifier, when voltage lower than pin 6 of the voltage of pin 5, hysteresis comparator overturns, pin 7 output low level, metal-oxide-semiconductor Q1 turns off, pin 1 and the pin 2 of relay do not have electric current to pass through, pin 3 and the pin 4 of relay disconnect, thus cut off the internal circuit of charger and the connection of battery, diode D1 is Opposite direction connection, electric current is not had to pass through, thus achieve short-circuit protection.
Visible protective circuit of the present invention; realize instead filling protection, short-circuit protection by hysteresis comparator and relay; battery reverse connecting protection is realized by resistance and diode; thus on onboard charger, achieve short-circuit protection, reverse connecting protection simultaneously, prevent that battery is counter to be filled, improve onboard charger serviceability.
Below be only that the preferred embodiment of the present invention is described; technical scheme of the present invention is not limited to this; the any known distortion that those skilled in the art do on the basis that major technique of the present invention is conceived all belongs to the claimed technology category of the present invention, and the concrete protection range of the present invention is as the criterion with the record of claims.
Claims (8)
1. the protective circuit of an onboard charger, it is characterized in that, comprise amplifier chip U1, diode D1, diode D2, metal-oxide-semiconductor Q1, electric capacity C1 ~ C2, relay R L1 and some resistance, described electric capacity C2 is connected in parallel on power output end OUT1+ and OUT1-of onboard charger, described amplifier chip U1 includes 8 pins, described relay R L1 comprises 4 pins, wherein pin 3 and pin 4 are controlled normally opened contact, the pin 8 of described amplifier chip U1 is connected with voltage source V CC, pin 4 is connected with power output end OUT1-, pin 3 is connected with resistance R6, resistance R6 is connected with voltage source V CC, pin 2 is connected with pin 1, pin 1 is connected with pin 6 by resistance R8, pin 6 is connected with pin 7 by resistance R7, one termination pins 5 of described electric capacity C1, another termination power output end OUT1-, pin 5 connecting resistance R4 and resistance R5, another termination power output end OUT1-of resistance R5, the other end of resistance R4 is connected with power output end OUT1+, the cathode of diode D1 is connected with power output end OUT1+, sun level is connected with resistance R1, the other end of resistance R1 is connected with the charging output OUT2+ of protective circuit, the pin 3 of relay R L1 meets power output end OUT1+, the pin 4 of relay R L1 is connected with charging output OUT2+, the pin 1 of relay meets voltage source V CC, diode D2 is parallel to pin 1 and the pin 2 of relay R L1, the negative electrode of diode D2 connects the pin 1 of relay, the pin 2 of relay is connected with the drain electrode of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor Q1 is connected with power output end OUT1-, the grid of metal-oxide-semiconductor Q1 is connected with the pin 7 of amplifier chip U1, power output end OUT1-is connected with charging output OUT2-by resistance R2.
2. protective circuit according to claim 1, is characterized in that, described amplifier chip U1 adopts the amplifier with built-in a reference source.
3. protective circuit according to claim 1, is characterized in that, the amplifier chip of wherein said amplifier chip U1 to be model be NCS1002-D.
4. protective circuit according to claim 3, it is characterized in that, two transport and placing devices are integrated with in wherein said NCS1002-D amplifier chip, the pin 1 of described NCS1002-D amplifier chip and the pin 7 of described NCS1002-D amplifier chip are respectively as the output of two transport and placing devices, the pin 4 of described NCS1002-D amplifier chip is connected to the end in the same way of the first transport and placing device with the pin 3 of described NCS1002-D amplifier chip after voltage stabilizing didoe, the pin 2 of described NCS1002-D amplifier chip is connected to the backward end of the first transport and placing device, the pin 5 of described NCS1002-D amplifier chip is connected to the end in the same way of the second transport and placing device, the pin 6 of described NCS1002-D amplifier chip is connected to the backward end of the second transport and placing device, the pin 8 of described NCS1002-D amplifier chip provides voltage source for whole amplifier chip.
5. the protective circuit according to any one of claim 1-4, is characterized in that, draws the test side of relay operating state at pin 2 end of described relay.
6. the protective circuit according to any one of claim 1-4; it is characterized in that; VOL_DET test side is drawn between described resistance R4 and resistance R5; described VOL_DET test side is connected to single-chip microcomputer; described single-chip microcomputer judges when the output voltage of VOL_DET test side is lower than certain value; turn off power stage, realize double protection functions.
7. the protective circuit according to any one of claim 1-4, is characterized in that, the power output end OUT1-ground connection of described onboard charger.
8. the protective circuit according to any one of claim 1-4, is characterized in that, described resistance R4 is made up of the resistance that two are connected mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310107211.0A CN103199503B (en) | 2013-03-29 | 2013-03-29 | Protective circuit of vehicle-mounted charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310107211.0A CN103199503B (en) | 2013-03-29 | 2013-03-29 | Protective circuit of vehicle-mounted charger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103199503A CN103199503A (en) | 2013-07-10 |
| CN103199503B true CN103199503B (en) | 2015-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310107211.0A Active CN103199503B (en) | 2013-03-29 | 2013-03-29 | Protective circuit of vehicle-mounted charger |
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| CN (1) | CN103199503B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052133B (en) * | 2014-07-15 | 2016-09-14 | 中国兵器工业第二0八研究所 | Electric automobile battery charger output protection circuit |
| CN107139743B (en) * | 2017-04-21 | 2019-06-07 | 广州视源电子科技股份有限公司 | Charger |
| CN107947145B (en) * | 2017-12-13 | 2019-05-28 | 郑州云海信息技术有限公司 | A kind of anti-battery reversal connection circuit of charged pool power module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101965091A (en) * | 2009-07-24 | 2011-02-02 | 海洋王照明科技股份有限公司 | Locomotive assisted illuminating lamp |
| CN202424283U (en) * | 2012-02-09 | 2012-09-05 | 广州市君盘实业有限公司 | Charger based on single-chip three-end TOP22X integrated chip |
| CN202817724U (en) * | 2012-08-31 | 2013-03-20 | 华南理工大学 | Battery protection circuit for electric vehicle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100921647B1 (en) * | 2007-12-28 | 2009-10-14 | 넥스콘 테크놀러지 주식회사 | A Over Voltage Prtection Circuit of Cell of Battery Pack for a Hybrid Electric Vehicle and the method thereof |
-
2013
- 2013-03-29 CN CN201310107211.0A patent/CN103199503B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101965091A (en) * | 2009-07-24 | 2011-02-02 | 海洋王照明科技股份有限公司 | Locomotive assisted illuminating lamp |
| CN202424283U (en) * | 2012-02-09 | 2012-09-05 | 广州市君盘实业有限公司 | Charger based on single-chip three-end TOP22X integrated chip |
| CN202817724U (en) * | 2012-08-31 | 2013-03-20 | 华南理工大学 | Battery protection circuit for electric vehicle |
Non-Patent Citations (1)
| Title |
|---|
| 基于PWM降压转换器AP3003的车载充电器的系统设计;袁珊珊;《电源世界》;20080115(第1期);54,71-72 * |
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| CN103199503A (en) | 2013-07-10 |
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